How to Fix Bosch Washer Error F20

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⚠️ Safety Warning: Appliance repair involves electricity, gas, and moving parts. Always disconnect power before working on any appliance.

Error Code: F20 Difficulty: Hard

Problem: Unexpected heating during the cycle.

⚖️ Repair Decision

✅ WORTH FIXING

Parts under $100

How to Fix F20 Error (Step-by-Step)

Disconnect the washer from its power source and confirm the error stays cleared during a full test cycle.
Access the main control board, which is typically located behind the control panel or in the top section of the machine.
Locate the heating element relay on the control board. It is a small, often black, rectangular component.
Carefully desolder the old relay from the control board using a soldering iron and desoldering pump or wick.
Solder the new heating element relay onto the control board, ensuring all connections are secure.
Reinstall the control board and any panels that were removed.
Reconnect the power and run a cycle to ensure the heating issue is resolved.
Turn the appliance off, wait about 2 minutes, then turn it back on.

OEM Part #: NTC Sensor

Estimated Market Price: $5-$135

Verified Compatible Alternatives:

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.

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Appliance Age

Estimated repair cost (parts, or parts + labor) Most DIY parts are $50–$250. If you have a quote, use the total.

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Get the ‘Secret Service Mode’ Cheat Sheet for your Bosch model. Includes an easy-to-read list of every error code and quick diagnostic tips.